JPS58106241A - Vibration preventive device - Google Patents

Abstract

PURPOSE:To obtain excellent anti-vibrative performance and make the construction in small size and lightweight by opposing the elasticity of an initially coned disc spring to the relative displacement of the cylinder to piston caused by an external force and by allowing the fluid friction between a viscous fluid and a bulkhead to perform a damping action. CONSTITUTION:Two initially coned disc springs 26, 27 are arranged between cylinder 10 and piston 18. O-rings 28-31 are fitted between these disc springs and the bulkheads 17, 23 of cylinder 10 and piston 18, and a chamber 32 is filled with a viscous fluid. Vibration suppressing effect is obtained through action of an orifice formed between these bulkheads 17, 23.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration isolator, and more particularly to a vibration isolator that shares both elasticity and damping properties. The cylinder 1 generally has the disadvantage of being long and heavy, and as shown in FIG. In the case where the mesh 4 is provided, the load w-2 of the mesh 4 is
As shown in the deflection a characteristic tJII21, the spring constant increases with deflection, and the friction between the meshes produces a damping effect, so unless the deflection becomes large, sufficient damping performance cannot be obtained, and stable vibration isolation properties cannot be achieved. The disadvantage is that it is difficult to obtain.

The present invention has been made under the above circumstances, and its object is to provide a vibration isolator that is small and lightweight but has excellent vibration damping properties.

The present invention provides a pair of disc springs which are spaced apart in the axial direction and whose inner and outer peripheral parts are respectively locked to a vignette and a cylinder, and which are surrounded by these disc springs, a cylinder, and a piston and are located within nine chambers. A radially projecting barrier is provided on at least one of the cylinder and the piston, and the chamber is filled with a viscous fluid. Therefore, the relative displacement between the cylinder and piston due to external force is counteracted by the elasticity of the disc spring, and damping is performed by the fluid friction between the viscous fluid and the barrier, so stable vibration damping characteristics can always be obtained. Additionally, desired vibration damping characteristics can be easily obtained by appropriately combining a disc spring, a barrier, and a viscous fluid, and the device can be easily manufactured in a small size and light weight.

Hereinafter, the present invention will be described with reference to an illustrated embodiment. Third
In the figure, a cylinder 10 has an opening 11 formed at one axial end and an axial screw hole 12 formed at the other end.
This screw hole 12 is for ventilation as well as for connection as described later, so if there is no need for connection, it may be a simple through hole.Also, the cylinder 10
are formed on the peripheral wall 13 at a distance in the axial direction, and a pair of step portions 1
4.15' (0 cylinder 10 has a stepped portion 14,
An axially extending spacer 16 is provided between 15 and is provided with a radially inwardly projecting barrier 11.

A piston 18 is inserted into the cylinder 10 from the opening 11 so as to be able to reciprocate in the axial direction.

The piston 18 has an axial threaded portion 19 formed at one end.
The piston 18 also has a companion nut body 20' (screwed onto the threaded portion 19). A spacer 22 is provided which extends in the axial direction and is located between the step part 21 and the spacer 22. The spacer 22 has a barrier 23 which projects radially outward and can face the barrier 11 of the cylinder 10. The piston 18 has a relatively large-diameter screw hole 24 formed at one end as necessary, and a relatively small-diameter screw hole 24 formed at the other end communicating with this screw hole 24. The threaded hole 24 and the through hole 25 are provided with an appropriate ventilation hole instead of these, and the threaded hole 12 of the cylinder 10 is provided with an appropriate ventilation hole instead of these. Either one of them may be omitted or not penetrated. One disc spring 26 disposed on one end side of the cylinder 10- has an inner circumferential portion that is connected to the nut body 20 of the piston 18. and the spacer 22, and the outer peripheral portion is inserted and locked between the stepped portion 14 of the cylinder 10 and the spacer 16.
It is locked. Further, the other disc spring 27 disposed on the other end side of the cylinder 10 has an inner circumferential portion that is connected to the stepped portion of the piston 18.
1 and the spacer 22 and are locked,
The outer peripheral portion is inserted and locked between the stepped portion 15 of the cylinder 100 and the spacer 16. Then, the disc springs 26, 27 and the barriers 1'i, 2B of the cylinder 10 and piston/18
O-rings 28, 29 and 30, 31 are installed between them, respectively. In addition, the disc springs 26°27 are
The cylinder 10, the piston 18, and the pair of disc springs may be provided together, and the elasticity thereof is preferably set so that each tip of the barrier 11.23 substantially faces the desired static load. 2
A chamber 32 surrounded by 6 and 21 is filled with viscous fluid. The viscosity of this fluid is determined by the barrier 171.
It is set appropriately in relation to the size of the orifice 33 formed between the holes 23 and 23.

The vibration isolator A configured as described above has a short axial length, so it is small and lightweight, and has a simple structure and can be easily manufactured, so it is low cost. Furthermore, the disc spring 26.
A desired elasticity can be easily obtained by appropriately setting the characteristic of 2f/, and a desired damping characteristic can be obtained by appropriately setting the viscosity of the viscous fluid in relation to the orifice 33.

As illustrated in FIG. 4, a plurality of vibration isolators A k ,
The other piston 18 is inserted into the threaded hole 12 of one cylinder 10.
They can also be connected to each other by screwing the threaded portions 19 of the two, or as illustrated in FIG. It is also possible to hang L).

74-,! rr, the present invention is limited only to the above embodiment'(H4fJ',<, for example, one of the barriers 17 and 23 may be omitted.

The shape of the first ori-nois 33 can be changed in various stages as necessary. If necessary, the spacers 16 and 22 may be provided on the bodies of the cylinder 10 and the piston 18, respectively. In addition, various transformations and boiling methods are possible within the scope of the gist of the present invention.

[Brief explanation of drawings]

:A< 1 is a cross-sectional view showing conventional example 2, FIG. 2 is a diagram showing the turbulence-deflection characteristics of the same example, FIG. 3 is a cross-sectional view showing an embodiment of the present invention, and FIGS. FIG. 5 is an explanatory diagram showing a different application example of the same example. 10...Cylinder, 17.23...Barrier, 18...
・Piston, 26.27... disc spring, 32... chamber,
33... Orifice. Applicant's agent Patent attorney Takehiko Suzue + Figure i
2 spears, 3 spears

Claims (1)

[Claims] a cylinder, a piston inserted into the cylinder so as to be able to freely reciprocate in the axial direction, and a pair of disc springs spaced apart in the axial direction and each having an inner circumferential portion and an outer circumferential portion locked to the piston and the cylinder, respectively; A barrier surrounded by the disc spring, the cylinder and the piston, and located in a companion chamber, provided on at least one of the cylinders and the piston, and protruding in the radial direction; and a viscous fluid filled in the chamber. A vibration isolator characterized by: